Mortgage Loans (Details) (USD $) In Millions, unless otherwise specified		0 Months Ended
Mar. 31, 2014 sqft	Jun. 03, 2013 US Airways Building sqft	Jun. 03, 2013 PKY W. Rio Salado, LLC US Airways Building
Debt Instrument [Line Items]
Area of real estate property (in square feet)	3,073,000	225,000
Mortgage secured for properties in a business acquisition			$ 3.5
Mortgage Loans on Real Estate, Interest Rate		3.00%

The stated interest rate on the mortgage loan receivable or the weighted average interest rate on a group of loans.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 10

-Section S99

-Paragraph 6

-Subparagraph (SX 210.5-04.(c) Schedule IV)

-URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 29

-Article 12

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph c

-Subparagraph Schedule IV

-Article 5

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 948

-SubTopic 310

-Section S99

-Paragraph 1

-Subparagraph (SX 210.12-29)

-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014

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